Event: Parkinson

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Opponent Rating Result
Kevin Winter 144 ½ - ½
Karim Khan 145 0 - 1
Sam Scurfield 137 0 - 1
Ludi Simpson 167 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

48 = (593 + 400 * (1 - 2)) / 4)

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